Electric-arc lamp



'(No Model.) 2 Sheets-Sheet 1.

E. A. SPERRY.

' ELEOTRIG ARC LAMP. 7 No. 405,440. N Patented June 18,1889.

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(No Model.) 2 SheetsSheet 2. E. A. SPERRY. EL'EGTR-IO ARC LAMP.

No. 405,440. Patented June 18, 1.889..

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UNITEn STATES PATENT OFFICE.

ELMER A. SPERRY, OF CHICAGO, ILLINOIS.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 405,440, dated June 18, 1889. Application filed October 22, 1888. erial No. 288,813- (No model.)

To all whom it may concern Be 1t known that I, ELMER A. SPERRY, re-

siding at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Arc Lamp, of which the following is a specification.

My invention relates to are lamps, and has for its object to provide a cheap, simple, and effective lamp.

My invention is illustrated in the accompanying drawings, wherein Figure l is a vertical section. Fig. 2 is a vertical section at right angles to the other. Fig. 3 is a horizontal section. Fig. 4 is a de tail of the cut-out magnet. Fig. 5 is a detail of the carbon-clamp.

Like parts are indicated by the same letter in all the figures.

A is the top of the case, B B the sides, am: 0 the bottom. On the case A A are the thimbles A A, into which are secured the carbontubes A A 0' is a sheet of insulation on the bottom of the case, and upon which is placed the base 0 D D are standards on the base C and projecting from them are the springs D D, which support the frame D In the top and bottom of this frame are apertures for the free passage of the carbon rods D D Secured to the upper part of the frame D is the electro-magnet or solenoid D which is in the main circuit from binding-post D to bindingpost D the connection being made from binding-post D to magnet D by the connector D and from such magnet to the frame and carbon rods.

D is a pivoted armature for the magnet or solenoid D, and to it is connected by the link D the carbon-clamp D which surrounds the carbon rod, and as its angle is changed clamps or releases the same. Secured to the same armature is the trip D, which engages the lower end of the pivoted variable stop E. This stop is adjustably supported 011 the standard E and carries a weight E at its upper end, which causes it to normally incline away from the lug E on the clamp D E is a spring, which opposes the action of the magnet or solenoid on the clamp D when F is a link from the extended end of the armature D to the piston F in the dash-pot F which is secured to the upper portion of the frame D and contains the stop F.

G is a derived or short circuit magnet or solenoid supported on the base-plate O and connected with the poles D and D by the connectors G and G It contains a movable core G pivoted to the lever G This latter lever is pivoted to the standard D at one end and at its other end carries the dash-pot G which reciprocates over the plunger G and is upwardly drawn by the spring G which is secured to the adjustable lever G so the tension of the spring may be varied. In the form of the device as shown there are two shunt-magnets or solenoids, their cores being connected by the armature G, and there are two levers G each pivoted to one of the standards D and both connected at their ends.

From the vertical sides of the frame D project thearms H H, each of which rests upon one of the rollers J J on the levers G I Th ese levers are connected togethernear their pivotal points by the cross-rod K. On one of the levers G is the arm L,Whicl1 finds a stop when the lever G is greatly depressed against the insulator L on the spring-actuated pivoted lever L This lever L when it finds a rest against the piece L serves to make a connection between the connectors L and L which lead to the binding-post, and thus a current is formed through the electro-magnet L The same is wound with a small quantity of heavy wire, so that the entire lamp is cut out.

M is a lever pivoted to the pendant M, upwardly held by the spring M and having at one end the stop M in the line of the descent of the cap M on the carbon rod D and at its other end the carbon-rod-sustainin g clamp M N N are the bars which support the lower portion of the lamp N, a conductor leading to the bin ding-post D; and N and N the linewires.

O is the base of the lamp, to which is secured the carbon-protecting tube 0, one for each carbon, and to these tubes is secured by the setserew O the bottom 0, on which rests the globe O Connector N, emerging below from the rod, passes through the insulator N and thence to the plate N, which is provided with apertures N for the clamping-piece N This clamping-piece has secured to its lower end the annulus N and is pivoted at N" to the arm N One end of this arm rests on the plate The other end is pivoted at the point N to the clamping-piece N, which is bellcranlclever-shaped.

N is a set-screw passing through the end of this latter clam ping-piece and resting upon the plate N. Duplicate parts wherever necessary will be supplied to make the lamp operate with two carbons, as the elements described are equally operating with one or more carbons.

I is the lower carbon. I have called the stop E a ,variable stop because it varies in the position which it occupies, and hence in the effect which it produces upon the clamp or clamps I).

The use and operation of ll'l)'lllVOl1lLlOll are as follows:

The current passes in through the conductor U into the binding-post I), through conductorD' to n'iain'circuit magnet or solenoid D", thence to the metallic parts of the in- .ner frame, thence to the carbon rods, through the carbons, through conductor N to binding-post l), thence on to line-wire This operation takes place when first a current is turned into the line. The immediate effect thereof is to draw up the armature D from its normally-depressed position, thus raising the link F and piston F in the dash-pot F from the stop F, at the same time lifting the clamp D bodily and separating the carbons to establish the arc, and then, finally, by the act-ion of the arm I) against the lower end of the stop E, throwing the latter into the upright position, where its end engages the lug IE rather than the main body of the clamp D'". In short, the immediate action of such current is to bring the parts in to the position shown in Fig. 1, whereby the are is established. Now a portion of the current begins to flow from binding-post I), through conductor G, to the de rived-current electro-magnets or solenoids G G, thence through conductor G to binding-post D. The quantity of current passing through the magnets G G varies, of course, with the variation of theresistance in the main circuit within the lamp, and thus by the movement of the cores G G in opposition to the spring l the levers G" are jointly rocked, thus imparting the reciprocating motion to the frame which supports the main-circuitelectromagnet or solenoid and clamps, and which I have denominated the carbon-separating device. The motion of this device feeds the carbons, the clamp D being caused to operate by the stop E receiving the lug thereon. The spring-frame will have an approximately parallel movement. The stop must be variable, as indicated, for the clamp must operate in different planes and at different positions along the line of the movement of the carbon rod. Thus when the clamp is raised in the first instance to separate the carbons it must clamp the rod at a position nearer the base'of the case than when it clamps the rod for feeding purposes; or, in other words, the point at which the clamp releases the rod during the process of feeding is higher up than the point at which it clamps the rod for separating the carbons, and if the stop remain con stant in its inclined position, engaging the clamp on its main surface and not on its lug, the carbon rod would instantly clamp, and the feeding could not be accomplished; hence the arrangement of the variable stop. The carbon-rod clamp when outof action normally rests its main surface upon the end of the inclined or tilting stop. The armature D is supported at a distance from its core by the stop I and the carbon rod can freely move vertically. As soon as the magnet or solenoid D" is energized, the armature is drawn up and the clamp seizes the .rod at such a distance from the base-plate (J as would permit the separation of the carbons by the continued motion of the armature I) toward its magnet. The clamp is lifted bodily, so that, in order to release the carbon rod as necessary in the process of feeding, it must have a new or elevated stop. \Vhen the levers (l are caused to descend greatly, as would be the case in the event of an abnormal resistance in the main circuit within the lamp, the arm L would cause the switch or pivoted piece If to close the circuit through conductors I) and I), and thus cut out the entire lamp. hen the lower carbon is being dzwed in position, it is inserted through the clampingpiece N and the parts brought into the position shown in Fig. If, now, the thumbscrew N be rotated, it will have the effect of raising the end of the arm N thus bringing the two clamping-pieces N and N together to clamp the carbon,.and at the same time forcing the plate N against the plate N and securely locking the carbon in the position in which it placed.

The stop above described as a variable stop may also be called a double-acting stop. The entire device consisting of the parallel moving frame supported on elastic bars and containing the main-circuit electromagnet or solenoid and carbon-rod clamp is described as a carbon-se iarating device, since its office is to seize and separate the carbons in the first instance. The entire frame is then bodily moved by means of the derivedcircuit electro-magnet or solenoid for the purpose of feeding the carbons.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is as follows:

1. In an arc lamp, the combination of a main-circuit electromagnet or solenoid with a moving frame on which it is supported, a carbourod-clamping device moved by said electro-i'nagi'iet or solenoid, and a shunt-magnet or solenoid adapted to move said frame.

2. In an arc lamp, the combination of a main-circuit electro-magnet or solenoid with a moving frame on which it is supported, a carbon-rod-clamping device moved by said electro-magnet or solenoid, and a shunt-magnet or solenoid adapted to move said frame, said moving frame suspended on spring-bars.

3. In an arc lamp, the combination of a main-circuit electro-magnet or solenoid with a moving frame on which it is supported, a carbon-rod-controlling device moved by said electro-magnet or solenoid, and a derived-circuit electro-magnet or solenoid adapted to move said frame.

4. In an arc lamp, the combination of a moving frame with a main-circuit electromagnet or solenoid supported on such frame, a carbon-rod clamp actuated thereby, and a lever pivoted at one end and attached toward its other end to an armature of the derivedcircuit electro-magnet or solenoid and connected with such frame, so that the movement of the latter is affected by the derivedcircuit electro-magnet or solenoid.

5. I11 an arc lamp, the combination of the moving frame with a main-circuit electromagnet or solenoid supported thereon, a car bon-rod clamp actuated thereby, and a lever fulcrumed on a rigid support attached to the armature of the derived-circuit electro-magnet or solenoid, and connected with such frame, so that the motion of the frame is affected by the derived-circuit electro-magnet or solenoid.

6. In an arc lamp, the combination of a moving frame with a main-circuit electro-magnet or solenoid supported thereon, a carbon-rod clamp actuated thereby, and a lever fulcrumed at one end and attached toward its other end to the armature of the derived-circuit electro-magnet or solenoid, an elastic support for such lever opposing the derived-circuit electro-magnet or solenoid, said frame resting upon said lever.

7. In an arc lamp, the combination of amovin g frame with a main-circuit electro-magnet or solenoid supported thereon, a carbon-rod clamp actuated thereby, and a derived-circuit electro-magnet or solenoid, a lever rigidly supported at one point and elastically supported at another and connected with the frame and the derived-circuit electro-magnet or solenoid, so that the latter affects the movement of the former.

8. In an arc lamp, the combination of a carhon-separating electro-magnet or solenoid with a carbon-clamp connected therewith and operated thereby, a derived-circuit electromagnet or solenoid, and an armature operated by the latter and connected with the former, so as to move the said carbon-separating magnet or solenoid.

9. In an arc lamp, the combination of a moving carbon-separating device containing a main-circuit electro-magnet or solenoid and a carbon-rod clamp controlled thereby to separate the carbons, with a derived-circuit electro-magnet or solenoid, and an armature connected therewith and operated thereby, and connected also with the moving carbon-separating device.

10. In an arc lamp, the combination of a moving main-circuit carbon-separating electromagnet or solenoid with a carbon-clamp connected therewith and operated thereby, a derived-circuit electro-magnet or solenoid, and a lever connected with said carbon-separating device and operated by the derived-circuit electro-magnet and solenoid, said lever supported fixedly at one end and elastically at the other.

11. In an arc lamp, the combination of a carbon-separating device, consisting of a parallel moving frame, a main-circuit electromagnet or solenoid supported thereon, a carbon-rod clamp supported. by such electromagnet or solenoid, with a derived-circuit electro-magnet or solenoid, and an armature extending between the latter magnet and the frame, so that it affects the motion of said frame.

12. In an arc lamp, a moving carbon-separating device containing the main-circuit electro-magnet or solenoid and the carbonrod clamp, in combination with a double-act ing stop for the clamp, both clamp and stop controlled by said magnet.

13. I11 an arc lamp, an electromagnet mounted on a movable frame, in combination with a carbon-rodclamping device and a double-acting stop for such clamp, both carbon-rod clamp and the stop therefor actuated by said electro-magnet.

14;. In an arc lamp, an electro-magnet mounted on a moving frame, a carbon-rod clamp, a double-acting stop for such carbonclamp, and a derived-circuit electro-magnet, an armature therefor connected with the clamp, both clamp and stop being actuated by the first-mentioned magnet or solenoid, and the clamp by the second-mentioned electromagnet or solenoid.

15. In an arc lamp, an electro -magnet mounted on a movable frame, in combination with a carbon-rod-clamping device, a doubleacting stop for such clamp, connections from the electro-magnet or solenoid to the clamp and stop, and a derived-circuit electro-magnet or solenoid, and an armature actuated thereby and connected with the carbon-sepa rating device.

16. In an arc lamp, the combination of a moving elastically-supported carbon-separating device, which contains a main-circuit electro-magnet or solenoid and a carbon-rod clamp, a double-acting stop for said clamp, a derived-circuit electro -magnet or solenoid, and an armature actuated by the last-mentioned electro-magnet or solenoid and connected with so as to move the earbon-separating device.

17. In a carbon-clamp for are lamps, the combination of two opposed carbon-clamping pieces, one shaped like a bell-crank lever, an

arm on which both are pivoted, the one at its angle, and means for moving said latter piece to control the carbon.

18. In a carbon-clamp for are lamps, the 5 combination of two opposed carbon-clamping pieces, one shaped like a bell-crank lever, an arm on which both are pivoted, one at its angle, and means for simultaneously moving the pivoted end of said arm and swinging the angular piece on such pivot to cause the pieces 10 to clamp or release the carbon.

ELMER A. SPERRY.

\Vitnesses: V

FRANCIS W. PARKER, CELESTE P. CHAPMAN. 

